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Microchip Technology MPLAD18KP85AE3
- Part No.:
- MPLAD18KP85AE3
- Manufacturer:
- Microchip Technology
- Category:
- TVS Diodes
- Package:
- Nonstandard SMD
- Datasheet:
-
MPLAD18KP85AE3.pdf
- Description:
- TVS DIODE 85VWM 137VC PLAD
- Quantity:
- Payment:
- Shipping:
Inventory:6,579
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Product details
Overview
MPLAD18KP85AE3 from Microsemi is a unidirectional surface-mount transient voltage suppressor (TVS) designed for high-energy surge protection in aerospace, automotive, and industrial power rails. It delivers 18,000 W peak pulse power at 10/1000 μs, clamps to ≤137 V at 1000 A, and features a 85 V reverse standoff voltage (VWM), 94.4–104.0 V breakdown voltage (V(BR)), and 0.7 °C/W junction-to-case thermal resistance - enabling robust secondary lightning protection per IEC 61000-4-5 and RTCA DO-160F Waveform 4 Level 4.
For engineers reviewing the MPLAD18KP85AE3 datasheet, MPLAD18KP85AE3 pinout, MPLAD18KP85AE3 application, or MPLAD18KP85AE3 equivalent, this device is selected for high-reliability DC bus protection where multi-stroke surge endurance, low thermal resistance, and RoHS-compliant surface-mount packaging are critical - especially in avionics power distribution, 24/28 V vehicle systems, and industrial PLC I/O modules.
Technical Context
This TVS diode operates as a clamping-type overvoltage protector with avalanche breakdown behavior, triggered when transient voltage exceeds its specified V(BR) range (94.4–104.0 V). Its metal-base cathode construction enables direct thermal coupling to PCB copper or heatsinks, supporting high-repetition surges under ≤0.05% duty factor per Figure 2.
It meets RTCA DO-160F Section 22 Waveform 4 (6.4/69 μs) Level 4 and IEC 61000-4-5 Class 1–5 (42 Ω source) requirements, with verified clamping performance up to 1000 A IPP and <100 ps response time - ensuring fast suppression of induced RFI, ESD (IEC 61000-4-2), and EFT (IEC 61000-4-4) events on sensitive power inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 18,000 W - sustains full-rated lightning surge energy without failure |
| Reverse Standoff Voltage (VWM) | 85 V - maximum continuous DC or peak AC voltage before conduction begins |
| Breakdown Voltage (V(BR)) | 94.4–104.0 V @ I(BR) - precise avalanche threshold ensures predictable turn-on margin |
| Max Clamping Voltage (VC) | 137 V @ 1000 A - limits downstream voltage stress during worst-case surge |
| Junction-to-Case Thermal Resistance | 0.7 °C/W - enables efficient heat transfer to PCB or heatsink for repeated surge handling |
| Standby Current (ID) | 10 μA @ 85 V - negligible leakage preserves system efficiency in standby |
| Temperature Coefficient (αV(BR)) | 102 mV/°C - stable voltage threshold across -55°C to +150°C operating range |
Pinout & Package
Package: Surface-mount PLAD (Plastic Leaded Anode Down) with metal base cathode terminal. Void-free UL94V-0 epoxy body; tin-lead or RoHS-compliant matte-tin plating; polarity marked by cathode on metal bottom surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (top-side leads) | Transient current entry point | Two parallel solderable leads connect to protected line; low-inductance path minimizes voltage overshoot |
| Cathode (metal base) | Current return / heat sink interface | Entire bottom surface serves as low-thermal-resistance thermal path and circuit ground reference |
Key Features
| Feature | Design Value |
|---|---|
| 18 kW surge rating with 10/1000 μs waveform | Validated for multi-stroke lightning compliance (RTCA DO-160F Section 22) without degradation |
| 0.7 °C/W RθJC thermal resistance | Enables >1000× surge cycles at 0.05% duty factor when mounted on FR4 with recommended pad layout |
| RoHS-compliant e3 marking | Meets EU Directive 2011/65/EU with annealed matte-tin plating compatible with lead-free reflow |
| IEC 61000-4-2/4-4/4-5 certified | Guaranteed ESD (±30 kV contact), EFT (4 kV), and lightning surge (42 Ω source, Class 5) immunity |
| Moisture Sensitivity Level 1 | No dry pack or baking required prior to assembly - reduces manufacturing overhead |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
Use Scenario: 28 V DC main bus in commercial aircraft avionics bays exposed to lightning-induced transients per DO-160F Section 22. IC Role / Device Role / Timing Role: Primary clamping TVS placed upstream of DC-DC converters and flight control electronics. Use Value: Limits bus voltage to ≤137 V during 1000 A surges, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers. | Use Scenario: 24 V battery-fed engine control unit (ECU) subjected to ISO 7637-2 Load Dump pulses up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS on input rail, absorbing 18 kW energy without thermal runaway. Use Value: Eliminates need for series resistors or active crowbar circuits - simplifies design while meeting AEC-Q101 reliability screening. |
| Industrial PLC I/O Modules | Railway Signaling Power Supplies |
Use Scenario: 24/48 V DC field-side power inputs in programmable logic controllers located near motor drives and solenoid valves. IC Role / Device Role / Timing Role: Secondary surge protector after primary MOV-based front-end, handling fast-rising inductive kickback. Use Value: Sub-100 ps response time clamps transients before they propagate into isolated RS-485 or analog input stages. | Use Scenario: 110 V DC auxiliary power supply in train signaling cabinets exposed to traction system switching noise and lightning coupling. IC Role / Device Role / Timing Role: High-energy TVS on rectified output rail, rated for IEC 61000-4-5 Class 4 (42 Ω source). Use Value: Withstands ≥1000 surges at 1000 A without parameter shift - validated via lot-level surge testing per RF01215 Rev B. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A (onsemi) | 600 W PPP rating, 5.0 mm × 4.5 mm SMB package, RθJA = 40 °C/W, no metal-base thermal path | Limited to single-stroke or low-duty-cycle surges; unsuitable for DO-160F multi-stroke validation | Select only for cost-sensitive, non-aerospace designs with <100 A surge exposure |
| SMCJ85A (Littelfuse) | 1500 W PPP, SMC package, RθJC ≈ 2.5 °C/W, 10× lower energy handling than MPLAD18KP85AE3 | Requires external heatsinking for >100 A surges; fails RTCA DO-160F Waveform 4 Level 4 validation | Use where board space is constrained but surge severity is moderate (e.g., consumer-grade UPS outputs) |
Compared with SMBJ85A and SMCJ85A, MPLAD18KP85AE3 provides 30× higher peak pulse power, 3.6× lower thermal resistance, and certified multi-stroke lightning resilience - making it the sole option for mission-critical 28 V/110 V DC systems requiring DO-160F or IEC 61000-4-5 Class 4–5 compliance.
Availability
MPLAD18KP85AE3 is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial PLC I/O modules requiring stable component supply across extended production lifecycles.
Supply support for MPLAD18KP85AE3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microsemi Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-tolerant, and high-power analog/mixed-signal solutions for aerospace, defense, and industrial markets.
The MPLAD series was developed specifically for high-energy, surface-mount transient suppression in safety-critical platforms - emphasizing thermal robustness, multi-stroke endurance, and qualification to RTCA DO-160 and MIL-PRF-19500 standards.
FAQ
What is the clamping voltage of MPLAD18KP85AE3 at 1000 A peak pulse current?
The MPLAD18KP85AE3 has a maximum clamping voltage (VC) of 137 V at 1000 A peak pulse current under 10/1000 μs waveform conditions. This value is guaranteed per RF01215 Rev B, Table on page 4, and defines the upper voltage limit imposed on protected circuitry during worst-case surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is MPLAD18KP85AE3 qualified to AEC-Q101 for automotive use?
Yes, MPLAD18KP85AE3 is tested in accordance with AEC-Q101 requirements, as stated in the RF01215 Rev B datasheet header. While not an automotive-qualified part by default, its AEC-Q101 test compliance - combined with load dump capability, 150°C max junction temperature, and surge-tested reliability - supports deployment in under-hood ECUs and battery management systems meeting ISO 7637-2.
Does MPLAD18KP85AE3 require a heatsink for continuous operation?
No - MPLAD18KP85AE3 does not require an external heatsink for transient suppression. Its 0.7 °C/W junction-to-case thermal resistance is designed for direct thermal coupling to PCB copper pour or chassis via the metal base cathode. Steady-state power dissipation is limited to 2.5 W at 25°C ambient; sustained DC power handling is not its function - it is optimized for short-duration, high-energy pulses only.
How does the e3 suffix in MPLAD18KP85AE3 indicate RoHS compliance?
The "e3" suffix in MPLAD18KP85AE3 explicitly denotes RoHS-compliant construction per JEDEC J-STD-609, using annealed matte-tin plating instead of tin-lead. This ensures compatibility with lead-free reflow profiles (up to 260°C for 10 seconds), eliminates hexavalent chromium in passivation, and meets EU Directive 2011/65/EU - confirmed in the "PART NOMENCLATURE" section of RF01215 Rev B.
Can MPLAD18KP85AE3 be used for bidirectional surge protection?
No - MPLAD18KP85AE3 is unidirectional, as indicated by the "A" (not "CA") suffix. For bidirectional protection at 85 V standoff, the correct variant is MPLAD18KP85CA. Using MPLAD18KP85AE3 in AC-coupled or floating applications risks reverse-bias breakdown and catastrophic failure; always match polarity suffix to system grounding architecture.
MPLAD18KP85AE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Package/Case:
- Nonstandard SMD
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 132A
- Power - Peak Pulse:
- 18000W (18kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Military
- Qualification:
- MIL-PRF-19500
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PLAD
MPLAD18KP85AE3 FAQ
1.How can I place an order for MPLAD18KP85AE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MPLAD18KP85AE3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MPLAD18KP85AE3 reliable?
The price and inventory of MPLAD18KP85AE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPLAD18KP85AE3 is usually 5 days.
3.What payment methods are accepted for MPLAD18KP85AE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPLAD18KP85AE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPLAD18KP85AE3?
MPLAD18KP85AE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPLAD18KP85AE3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MPLAD18KP85AE3?
For technical support, including MPLAD18KP85AE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPLAD18KP85AE3 requirements.
6.How does Aetrix verify that MPLAD18KP85AE3 is sourced from the original manufacturer or authorized distributors?
All MPLAD18KP85AE3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MPLAD18KP85AE3 meets industry standards.
7.What is the process for return or replacement of MPLAD18KP85AE3?
All MPLAD18KP85AE3 units undergo pre-shipment inspection (PSI). If there is an issue with MPLAD18KP85AE3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MPLAD18KP85AE3 part is unused and in its original packaging.
Return procedure for MPLAD18KP85AE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPLAD18KP85AE3 Tags
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